I take it this is in the UK as your talking in Pounds.
To Make your self bankrupt you need to apply to you local county court and you will be required to fill in a statement of your affairs (which the CAB can help) and they can be filled in online. This details you Debts, Assetts and reasons for insolvency.
You will need to attend the court where the Judge will make you bankrupt an the the Official Receiver will take over your affairs.
Before you fill the forms in, i would go and speak to the CAB or The CCCS (Credit Consumer Counselling Service) Who are very good. Both are free as well. There is no need to shell out any money other the and Bankruptcy Fee and the Court fees (which can be waved depending on your situation).
You will not necessarily lose your car or your house it depends on you specific circumstances. i.e if you need the car for work (and its not overly expensive) or if your house is in negative equity the Official Receivers interest can be bought out by a third party.
your income and expendature will be assessed to see if u can afford any payments to your creditors (usuall a 36 month agreement)
You may also be required to attend an interview to look over your statement of affairs and reasons for bankruptcy.
Although coming to an arrangement with your creditors sounds like a good idea it barely works out as the payments agreed are often less than the interest and charges being added each month.
The only time this is really effective is wen it is done uder an IVA.
You will only be Bankrupt for 1 Year despite what other people have said. If there is misconduct you may be subject to further restrictions but you will still be discharged after 1 year.
Also only a small ammount of professions/Jobs are affected by a bankrupcty Order
Hope That Helps!
Mike